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          使用axios解决跨域、显示mooc数据（正确版）
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              <time title="创建时间：2020-03-10 10:35:55 / 修改时间：10:36:26" itemprop="dateCreated datePublished" datetime="2020-03-10T10:35:55+08:00">2020-03-10</time>
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        <p>click look more</p>
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<blockquote>
<p>天杀的 vue cli 4  。一晚上就弄这个了<del>~</del>。之前的错误版该说的都说了，这次直接贴正确代码。不过有几点要先说。</p>
</blockquote>
<p>1.首先，不懂的一定要先看vue.config.js配置的官网：<a href="https://cli.vuejs.org/zh/config/#devserver-proxy" target="_blank" rel="noopener">https://cli.vuejs.org/zh/config/#devserver-proxy</a><br>2.之前在vue cli 2中，显示mooc和打印mooc都是在vue组件中写的，但是现在是直接在这个配置文件中写。<br>3.还有一些话写在了代码里</p>
<p>vue只看关键部分</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line">methods:&#123;</span><br><span class="line">    getHomeInfo()&#123;</span><br><span class="line">        &#x2F;&#x2F;首先 访问8080， axios去请求这么一个路径  </span><br><span class="line">        &#x2F;&#x2F;接下来，这个路径会到 vue.config.js中</span><br><span class="line">        axios.get(&quot;&#x2F;api&#x2F;index.json&quot;).then(this.getHomeInfoSucc)</span><br><span class="line">    &#125;,</span><br><span class="line">    getHomeInfoSucc(res)&#123;</span><br><span class="line">        &#x2F;&#x2F;这里可以在控制台中打印</span><br><span class="line">        console.log(res)</span><br><span class="line">    &#125;</span><br><span class="line">&#125;,</span><br><span class="line">mounted()&#123;</span><br><span class="line">    this.getHomeInfo()</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>接下来是重头戏：vue.config.js</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">const</span> path = <span class="built_in">require</span>(<span class="string">'path'</span>);</span><br><span class="line"><span class="keyword">const</span> mockdata=<span class="built_in">require</span>(<span class="string">"./mock/index.json"</span>)</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">resolve</span>(<span class="params">dir</span>) </span>&#123;</span><br><span class="line">    <span class="keyword">return</span> path.join(__dirname, dir);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="built_in">module</span>.exports = &#123;</span><br><span class="line">    lintOnSave: <span class="literal">true</span>,</span><br><span class="line">    chainWebpack: <span class="function">(<span class="params">config</span>) =&gt;</span> &#123;</span><br><span class="line">        config.resolve.alias</span><br><span class="line">        .set(<span class="string">'styles'</span>,resolve(<span class="string">'src/assets/styles'</span>))</span><br><span class="line">        <span class="comment">// 这里只写了两个个，你可以自己再加，按这种格式.set('', resolve(''))</span></span><br><span class="line">    &#125;,</span><br><span class="line">    devServer:&#123;</span><br><span class="line">        <span class="comment">//当Home.vue中的路径过来时，/api/index.json   因为是api开头，</span></span><br><span class="line">        <span class="comment">//所以这个路径被跨域到 http://localhost:8080/mock/index.json </span></span><br><span class="line">        <span class="comment">//即实际上访问8080时，访问的是http://localhost:8080/mock/index.json</span></span><br><span class="line">        <span class="comment">//这样就拿到了mooc的数据。</span></span><br><span class="line">        <span class="comment">//拿到之后，就回到vue开始执行then。   </span></span><br><span class="line">        <span class="comment">//到此结束！！！！</span></span><br><span class="line">        proxy: &#123;</span><br><span class="line">            <span class="string">'/api'</span>: &#123;</span><br><span class="line">                target: <span class="string">'http://localhost:8080'</span>,</span><br><span class="line">                pathRewrite:&#123;</span><br><span class="line">                    <span class="string">'^/api'</span>:<span class="string">'/mock'</span></span><br><span class="line">                &#125;</span><br><span class="line">            &#125;,</span><br><span class="line">            <span class="string">'/foo'</span>: &#123;</span><br><span class="line">            target: <span class="string">'http://localhost:8080'</span></span><br><span class="line">            &#125;</span><br><span class="line">        &#125;,</span><br><span class="line">        <span class="comment">//用来显示假数据，即如果直接访问 http://localhost:8080/api/index.json</span></span><br><span class="line">        <span class="comment">//就会在页面打印mock数据</span></span><br><span class="line">        port:<span class="number">8080</span>,</span><br><span class="line">        before(app)&#123;</span><br><span class="line">            app.get(<span class="string">'/api/index.json'</span>,(req,res,next)=&gt;&#123;</span><br><span class="line">                res.json(mockdata)</span><br><span class="line">            &#125;)</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;;</span><br></pre></td></tr></table></figure>
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